Comp-phys-alps-users

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1248 discussions

regarding the observavles in the dirloop_sse
by D´Souza, Sunil Wilfred 17 Aug '14

17 Aug '14

Dear Dr. Troyer, I am trying to calculate the observables such as binder cumulant and specific heat as a function of temperature (range 5K - 700 K) for bcc chromium in order to determine the Neel temperature by considering the Heisenberg spin 1/2 antiferromagnet model. After reading through the ALPS web documentation, i got the impression that i can use the dirloop_sse binary to accomplish the task. But, the observables like binder cumulant and specific heat are not … [View More]

2 1

dimerized chain with DMRG
by Stone, Matthew B. 17 Aug '14

17 Aug '14

Thank you for the response regarding my prior question regarding the dimerized chain. To follow up, I would like to ask a few more novice questions. Does the DMRG ALPS routine calculate the momentum for one-dimensional systems? Does the following unitcell definition have the appropriate open boundary conditions for efficient use of the DMRG routines? <UNITCELL name="anisotropic1d" dimension="1"> <VERTEX/> <EDGE type="0"> <SOURCE vertex="1" offset="0"/> … [View More]

2 1

Help regarding sparse diagonalization
by Sriluckshmy Viswanathan 15 Aug '14

15 Aug '14

Hi, I am writing a code for the computing gap in kitaev-heisenberg model on the honeycomb lattice using sparse diagonalization. When the coupling for the kitaev term is zero the model patch that I wrote should match the model that is inbuilt. But that doesnt happen. I may have made a mistake in the model patch which is as follows. <HAMILTONIAN name="kitaev heisenberg"> <PARAMETER name="J" default="1"/> <PARAMETER name="Jz" default="0"/> <PARAMETER name="Jx" default="0"/&… [View More]

2 7

query regarding the units
by D´Souza, Sunil Wilfred 14 Aug '14

14 Aug '14

Dear Alps users, In the tutorial "MC-07 Phase transition in the Ising model", what is the unit in which the temperature is defined. with best regards Sunil

2 1

Error: Cannot find a file named pyalea_c.so
by Niraj Ghimire 13 Aug '14

13 Aug '14

Dear alps users, I was able to build ALPS and everything worked except that I got one error when I used the command "make install." The error message reads: CMake Error at lib/pyalps/cmake_install.cmake:42 (FILE): file INSTALL cannot find "/home/guest/buildalps/lib/pyalps/pyalea_c.so" where guest is my user account and buildalps is my build directory for ALPS. I have no idea what this file (pyalea_c.so) is and why I am getting this error. Please help me. Thanks, Niraj

3 29

REQUEST
by Niraj Ghimire 12 Aug '14

12 Aug '14

Dear alps users/developers, I humbly request you to write stuffs on the ALPS webpage, especially on the "Build ALPS from source" section, in a clearer/nicer way. For linux and alps beginners, it's sometimes difficult to understand what different command lines (e.g., cmake -D Boost_ROOT_DIR:PATH...., cmake -DCMAKE_INSTALL_PREFIX...., etc.) do and how one can really use them. Please elaborate every step so that even beginners don't spend too much time to understand what they are doing.… [View More]

2 3

underflow error reading the file
by Georgios Zavitsanos 12 Aug '14

12 Aug '14

Hello, I am trying to run my first example using ALPS code for Ising model... So, reading the tutorials, I wrote the parameter-input- file (parm1a), I converted to the file parm1a.in.xml and then I tried to run the command: spinmc --Tmin 10 --write-xml parm1a.in.xml but, I received the error message: basic_filebuf::underflow error reading the file . I installed the ALPS packages before one week, so maybe there is something new in writing the input files ? Any ideas would be very helpful... … [View More]

2 2

Building alps from source
by Niraj Ghimire 08 Aug '14

08 Aug '14

Dear alps users, I have been trying to build alps from source on Fedora 20 and I am having issues. I am new to alps and Linux OS itself, so I am spending too much time. I followed the instructions on "Get dependent libraries and tools on Fedora 20" and that was easy to understand and work out. Now I am on "Build ALPS". Either the instructions on "Build ALPS" are not sufficient for a Linux beginner like me or I am not being able to follow them. Please provide me with detailed … [View More]

4 11

site dependent potential
by benoît grémaud 07 Aug '14

07 Aug '14

Dear All, If I got it correctly, to have a site dependent potential one can use the inhomogeneous lattice and specify 'mu' as a function of space. However, it seems to be restricted to alps-defined functions (including rand()), but I couldn't find a list of them. For instance, is there a delta-kronecker function or a step function available? As an alternative, is there a way to pass a well defined set of numerical values? For instance to tune the boundary chemical potential only, I had to … [View More]

1 0

instalation problem
by Hocine Ahmed 29 Jul '14

29 Jul '14

Hello I installed all debian library to install ALPS and I created a build directory. when I run make , I have this messages make[2]: *** No rule to make target « alps2/alps/src/alps/hdf5/archive.cpp », required for « src/alps/CMakeFiles/alps.dir/hdf5/archive.cpp.o ». stop. make[1]: *** [src/alps/CMakeFiles/alps.dir/all] Erreur 2 make: *** [all] Erreur 2 thank you to answer me Best regards ---------------------------… [View More]

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Comp-phys-alps-users